android之ListView与Adapter(结合JavaBean)

ListView

<ListView　　android:id="@+id/lv"　　android:layout_width="match_parent"　　android:layout_height="match_parent" />

item_list.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"     android:layout_height="match_parent">    <TextView        android:id="@+id/item"        android:layout_width="match_parent"        android:layout_height="45dp"        android:gravity="center_vertical"        tools:text="2015年10月22日 周四" /></LinearLayout>

适配器MyAdapter继承基类MyBaseAdapter（WeekBean查看android日期工具类）

import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import com.xh.boke.R;import com.xh.boke.base.BaseActivity;import com.xh.boke.base.MyBaseAdapter;import com.xh.boke.bean.WeekBean;import com.xh.boke.holder.ViewHolder;import java.util.List;/** * 测试Adapter * Created by Administrator on 2015/10/22 0022. */public class MyAdapter extends MyBaseAdapter<WeekBean> {    private TextView tv;    public MyAdapter(BaseActivity context, List<WeekBean> list) { super(context, list); }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        if (convertView == null) convertView = LayoutInflater.from(mContext).inflate(R.layout.item_list, null);        try {            tv = ViewHolder.get(convertView, R.id.item);        } catch (IllegalAccessException e) {            e.printStackTrace();        }        WeekBean bean = datas.get(position);        tv.setText(bean.year+"年"+bean.month+"月"+bean.day+"日"+"\t"+bean.weeks);        return convertView;    }}

功能优化之ViewHolder类

/** * view临时存储器 * Created by Administrator on 2015/10/22 0022. */import android.util.SparseArray;import android.view.View;public class ViewHolder {    /**     * 获取参数convertView中的指定id资源     * @param convertView 实例化之后的convertView，不为空指针     * @param id 指定id资源     * @return 在convertView中的与id对应的view     * @throws IllegalAccessException 当convertView为空时，抛出     */    @SuppressWarnings("unchecked")    public static <T extends View> T get(View convertView, int id) throws IllegalAccessException {        if(convertView == null)            throw new IllegalAccessException("convertView can not be null");        SparseArray<View> viewHolder = (SparseArray<View>) convertView.getTag();        if (viewHolder == null) {            viewHolder = new SparseArray<View>();            convertView.setTag(viewHolder);        }        View childView = viewHolder.get(id);        if (childView == null) {            childView = convertView.findViewById(id);            viewHolder.put(id, childView);        }        return (T) childView;    }}

在activity中使用

ListView lv = (ListView) findViewById(R.id.lv);List<WeekBean> list = getWeekDate();//查看android日期工具类MyAdapter adapter = new MyAdapter(this,list);lv.setAdapter(adapter);

更多相关文章

随机推荐